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Windows Forms FAQ resources

5. Windows Forms Datagrid

5.3 How do I prevent sorting a single column in my DataGrid?


You can do this by deriving the DataGrid and overriding OnMouseDowm. In your override, do a HitText and if the hit is on a column header that you do not want to sort, do not call the baseclass. Here is a code that sorts all columns except the second column

[C#]
//derived class
public class MyDataGrid : DataGrid
{
     protected override void OnMouseDown(MouseEventArgs e)
     {
          Point pt = new Point(e.X, e.Y);
          DataGrid.HitTestInfo hti = this.HitTest(pt);
          if(hti.Type == HitTestType.ColumnHeader && hti.Column == 1)
          {
               //don't sort col 1
               return; //don't call baseclass
          }
          base.OnMouseDown(e);
     }
}

[VB.NET]
'derived class
Public Class MyDataGrid
Inherits DataGrid

Protected Overrides Sub OnMouseDown(ByVal e As System.Windows.Forms.MouseEventArgs)
Dim pt As New Point(e.X, e.Y)
Dim hti As DataGrid.HitTestInfo = Me.HitTest(pt)
If hti.Type = HitTestType.ColumnHeader AndAlso hti.Column = 1 Then
'don't sort col 1
Return 'don't call baseclass
End If
MyBase.OnMouseDown(e)
End Sub 'OnMouseDown
End Class 'MyDataGrid